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Finding the Fourth Proportional to 644.33, 888.74 and 411.35

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Solution

The fourth proportional to 644.33, 888.74 and 411.35 is: 567.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.33 : 888.74 = 411.35 : x
  2. Step 2: Convert to fraction form
    644.33/888.74 = 411.35/x
  3. Step 3: Cross multiply
    644.33x = 888.74 × 411.35
  4. Step 4: Simplify right side
    644.33x = 365,581.14
  5. Step 5: Solve for x
    x = 365,581.14/644.33
  6. Step 6: Final answer
    x = 567.38

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Double scale
Find fourth proportional to 645.33, 890.11 and 412.35
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.